The RFCR6957 from RF-CI is a RF & Microwave Circulator with Frequency 5.7 to 6.8 GHz, Average Power Forward 25 W, Average Power Reverse 25 W, Peak Power 250 W, Insertion Loss 0.30 to 0.40 dB. Tags: Coaxial Circulator. More details for RFCR6957 can be seen below.